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Liquid Phase Carbon-Thirteen Dynamic Nuclear Polarization Study of Monosubstituted Aromatic Compounds

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dc.contributor.authorSong, Lien
dc.contributor.committeechairDorn, Harry C.en
dc.contributor.committeememberAnderson, Mark R.en
dc.contributor.committeememberWolfe, James F.en
dc.contributor.departmentChemistryen
dc.date.accessioned2014-03-14T20:52:27Zen
dc.date.adate1997-10-01en
dc.date.available2014-03-14T20:52:27Zen
dc.date.issued1997-09-18en
dc.date.rdate1997-10-01en
dc.date.sdate1997-09-18en
dc.description.abstractIn this work, liquid phase Carbon-thirteen DNP experimental data were collected in a flow transfer system for different mono-substituted aromatic compounds, such as, anisole, nitrobenzene and halobenzenes. These substitute groups covered a wide range of electronic effects from strong electron donating groups to strong electron withdrawing groups. Hammett linear free energy relationship was used to quantitatively study the electronic effect of substituent on the carbon-thirteen DNP enhancement. It was found that the carbon-thirteen DNP enhancements at meta and para positions exhibits a reasonable correlation. A better correlation of carbon-thirteen DNP enhancements with the Hammett inductive factor was observed. A large scalar dominated enhancement at ipso (C-1) position was observed for iodobenzene. This suggests that facile transfer of spin polarization to the C-1 carbon via the highly polarizable iodine atom is possible and the dominate electron transfer mechanism for this system. A model of polarization transfer via spin diffusion of abundant proton spins was examined. The results indicate that it is not important.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-82597-221112en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-82597-221112/en
dc.identifier.urihttp://hdl.handle.net/10919/36999en
dc.publisherVirginia Techen
dc.relation.haspartthesis.PDFen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectCarbonen
dc.subjectDynamicen
dc.subjectNuclearen
dc.subjectPolarizationen
dc.titleLiquid Phase Carbon-Thirteen Dynamic Nuclear Polarization Study of Monosubstituted Aromatic Compoundsen
dc.typeThesisen
thesis.degree.disciplineChemistryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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